Circle slice clipping mask doesn't clip in the right place

Title basically says it all. When I try using a circle slice to clip another object, the clipping area appears offset from the expected location.

To Reproduce:

  1. Create new widget
  2. Add some shape
  3. Add a circle slice underneath that shape (above the shape in the items list) (first image, image shows circle slice on top for illustrative purposes only)
  4. In the circle slice's properties, set FX->Mask to "Clip Next Module" or "Clip All"
  5. Resulting clip is not in the circle slice's original position. (Second image)